's a risk of landslides, like that one, in everett. the ground could also slide in seattle, tacoma and bremerton. one year, 365 days. that's how long american scott kelley and a russian will spend on the sbrshl space station. his trip will be the longest by an american on a single mission. john zarrella joins us now. tell us more, john. >> reporter: holding a briefing about the mission now and what to expect. in about an hour or so, maybe a little less, kelly and his russian counterpart will also hold a press briefing and talk about, you know, how they were selected, the process. and what they expect. you know, this is a huge, huge step, if you want to do a deep space mission, because so little is known about the long-term effects of weightlessness on the body. if you're talking about going to an asteroid or mars, you're talking about round trip missions of a year or two years if you're going to go to mars. weightlessness affects the blood pressure, eyesight. it affects bone density. it affects muscle mass. so many different things beyond just the technical issues that have to be u
